3D Horn Air Waveguide Antenna for Grating Lobe Suppression
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Solution Overview
Problem
Slotted waveguide antennas suffer from undesirable grating lobes in their far-field three-dimensional patterns, leading to decreased antenna performance.
Innovation Solution
A three-dimensional horn air waveguide antenna assembly is created using stamped metal layers with brazing material, featuring a horn air waveguide antenna area that widens from a bottom portion to a top portion, and a slot area connecting the channel and horn air waveguide areas, which can be symmetric or asymmetric to generate a narrower beam width, and is manufactured with a printed circuit board and pressure-sensitive adhesive for electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional slotted waveguide antenna is used, then the antenna structure is simple and easy to manufacture, but it produces undesirable grating lobes in the far-field three-dimensional patterns
Solution Approach 1:
The antenna structure is divided into multiple stamped metal layers (bottom layer, first top layer, second top layer, and third top layer) that are separately formed and then assembled through brazing. This segmentation allows each layer to be optimized independently to control the electromagnetic field distribution and eliminate grating lobes while maintaining manufacturability through standard stamping processes.
Solution Approach 2:
The invention transitions from a conventional two-dimensional slot array to a three-dimensional horn air waveguide structure with multiple layers stacked in the vertical dimension. The horn-shaped waveguide extends upward from the slot layer, creating a volumetric structure that controls radiation patterns in three dimensions and eliminates grating lobes by distributing energy more uniformly across the far-field sphere.
2Object-generated harmful factors
If a 3D horn air waveguide antenna with multiple stamped metal layers is used, then grating lobes are mitigated and beam width is narrowed, but the manufacturing process becomes more complex requiring brazing operations
Solution Approach 1:
The complex brazing process is extracted and standardized into a separate manufacturing operation. Each metal layer is pre-formed with precise geometries including the horn waveguide shapes and slot configurations, then the brazing step is applied uniformly across all layers using consistent parameters. This extraction allows the complexity to be managed as a discrete process rather than integrated throughout manufacturing.
Solution Approach 2:
The invention uses specific geometric parameters of the horn air waveguide (taper angles, layer spacing, slot dimensions) to control the electromagnetic radiation pattern. By optimizing these parameters, the structure achieves grating lobe suppression and narrow beam width while the brazing process parameters (temperature, time, atmosphere) are standardized to manage manufacturing complexity.
3Ease of operation
If the horn air waveguide antenna area is made asymmetric, then directional beam control is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The horn air waveguide antenna area is deliberately designed with asymmetric geometry where the left and right sides have different dimensions. This asymmetry creates directional radiation characteristics and controls the beam pattern in the far field. The asymmetric shape is consistently formed across all three top metal layers to maintain the directional property while distributing the precision requirements across multiple identical components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively mitigates grating lobes, enhancing performance metrics and making the antenna assembly suitable for various applications including radar systems, autonomous driving, aviation, and military uses by providing a more directive beam.
Implementation Method 1
a brazing material deposited between each stamped metal layer
Data Source
AI summary
A three-dimensional (3D) horn air waveguide antenna assembly and its method of manufacture include a bottom stamped metal layer defining a set of electrical connection ports and a plurality of top stamped metal layers arranged atop the bottom stamped metal layer with a brazing material deposited between each stamped metal layer, the plurality of top stamped metal layers defining a channel area proximate to the bottom stamped metal layer, a horn air waveguide antenna area that widens from a bottom portion to a top portion, and a slot area fluidly connecting the channel and horn air waveguide antenna areas.